HD500 Datasheet, PDF (5/10 Pages) Extech Instruments Corporation. – Heavy Duty Psychrometer + IR Thermometer

MIN-MAX Recording Mode
1. Press the MAX/MIN button (one for upper display and one for lower display) to begin
recording the Maximum and Minimum reading. The REC MAX icon will appear and only
the maximum value measured will appear in the display. The display will update only if a
value higher than the currently displayed value is measured.
2. Press the MAX/MIN button again to display the minimum values. The REC MIN icon will
appear and only the minimum recorded value will appear in the display.
3. Press the MAX/MIN button again to display the currently measured values. The REC
icon will appear in the display and the Max and Min values will be stored in memory.
4. Press and Hold the MAX/MIN button for >2 seconds to exit the mode.
Auto-Power Off
The meter will automatically turn off after 15 minutes of operation if no buttons are pressed
during this period. Auto-power off can be disabled by:
1. Hold the IRT button and then press the button to turn the power on. When “disAPO”
appears in the display, release the IRT button and the APO is disabled.
Low Battery
When the battery reaches the minimum operating voltage the battery icon will appear in
the display. Replace the 9V battery when this happens.
Battery Replacement
When the battery icon appears on the LCD, the 9V battery must be replaced.
1. The battery compartment is located on the rear of the meter.
2. Press in and down on the arrow located above the tilt stand hinge.
3. Replace the 9V battery
4. Replace the battery cover.
Backlight
Press the backlight button to turn the backlight ON or OFF.
Note: continuous use of the backlight function will reduce battery life.
USB Interface and Software
The HD500 is equipped with a communication jack on its upper left side. The supplied
communications cable connects to this jack and to a USB port on a PC. The supplied
software allows the user to view and save readings to the PC. Instructions for use and
features are detailed in the supplied software HELP utility.
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HD500 V3.1 12/07